Machinery for making satch el-bottom paper bags



2 sheetssheet 1.

(No Model.)

W. O. CROSS.

MACHINERY FOR MAKING SATOHEL BOTTOM PAPER BAGS.

Patented Aug. 26. 1885.

151012711572 MM Z- vrm N. WY. l 3 e s s M W N4 PETERS, FMm-Lilhngnpher. Washingwm n, r.

(No Model.) 2 Sheets-Sheet 2.

W. O. GROSS.

MACHINERY FOR MAKING SATGHEL BOTTOM PAPER BAGS.

No. 325,059. Patented Aug. 25, 1885.

mnnmnliiiiiiillll v UNITED STATES PATENT OEEicE.

XVILLIAM O. CROSS, OF BOSTON, MASSACHUSETTS.

MACHINERY FOR MAKING SATCHEL-BOTTOM PAPER BAGS.

SPECIFICATION forming part of Letters Patent No. 325,059, dated August 25, 1885.

Application filed May 21, 1885. (No model.)

I0 a whom, it may concern:

Be it known that I, XVILLIAM C. ORoss, of Boston, in the State of Massachusetts, have invented certain new and useful Improvements in Machinery for Making Satchel-Bottom Paper Bags, ofwhich the following is a specifica tion.

My present invention consists of certain improvements on machinery heretofore patented to me, the machine in which they are embodied comprising a diamond-fold-forming mechanism of the general character of that set forth in my Letters Patent No. 239,456, of March 29, 1881, and a second and third foldforming mechanism resembling that set forth in my Letters Patent No. 243,858, of July 5, 1881.

The improvements I have made are in the combination and arrangement of the rotary plate-knife folder, feed-rolls, and guide-finger; in the construction of the guide-finger; in the construction and arrangement of the rolls which press down the diamond fold and sever the central connection between the blank in rear and the blank in front, and in the construction and arrangement of the wiper-roll which presses down the third or final fold, these said improvements, while susceptible of separate application to satchel-bottom-paperbag machinery, resulting as a whole in the production of an improved machine for the manufacture of such bags.

The improvements can best be explained and understood by reference to the accompanying drawings in which Figure 1 is a longitudinal vertical central section of so much of my improved machine as needed for the purpose of explanation. Fig; 2 is a plan of the same with the paste tank and rolls removed. Fig. 3 is a side elevation of the same. Fig. 4 is a side elevation of the mechanism whereby the knife for making the final cut is operated once for every two revolutions of the roll which carries it. Fig. 5 is an axial section of said roll, showing the arrangement of the knife or cutter.

I have not deemed it necessary to represent the tube forming and pasting mechanism and the devices for making the main portion of the cross-cuts therein for the purpose of separating one blank from the other. These parts of the machine are well known to those acquainted with the art to which my invention relates and require no explanation. It is sufficient to say that the formed and pasted paper tube from which the bags are to be made passes forward around a former, A, the front end of which is shown in the drawings. By the time the tube reaches the rolls BB both of its plies have been cross-cut except at the center, and in passing between the two rolls in question the knife-carrying roll B, technically called the lip-cutter, makes a curved central cut, 1, Fig. 1, in the upper ply, thus completely severing this ply, leaving the blank I) in front connected to the tube a in rear by the central part, 2, of the under ply only.

In advance of the rolls B B are the feedrolls C O, which take hold of and carry along the nearly-severed blank I), and in advance of rolls 0 O are the rolls D D, which carry on their hubs or axles sprocket-wheels E. These wheels are power-driven, and, in conjunction with sprocket-wheels F, carry sprocket-chains G, on which are mounted, at suitable intervals apart, a number of plate-knife folders, H, there being three of said folders in the present instance. Intermediate between these two pairs of sprocket-wheels is the centrally-located guide-finger I, carried bysuitable brack' ets or supports fixed to the frame of the machine. From the front end of the former A extends, between the rolls 0 O and D D, a light spring strip or finger, 6, whose free end projects some distance in advance of the rolls D D. The free end of this spring strip or finger, for the purpose of distending or opening the mouth of the blank, stands normally up away from the table J (between which and the guide-finger the blank must pass,) and is in such proximity to the guide-finger that the upper ply of the distended mouth of the blank will pass from the end of the opener-strip z up against or over the guide-finger, so as to be held back thereby. I The parts are represented in this position in Figs. 1 and 2. At this time one of the plate-knife folders H has been brought to a position in which it meets the upper ply at the point where the central line of fold of the diamond is to be formed, and, moving as it does in unison with the feedshall be brought into better shape.

rolls, travels along with the blank, and as it meets the guide-finger creases the ply along said central line of fold, tucks it under the guide fingenand travels along with the blank until, after emerging from beneath the guidefinger, it rises and quits the diamond-folded blank, which by this time has its front end in the bite of the rolls K K in front, by which the diamond fold is pressed down.

In Figs. 1 and 2, bis the blank on which the diamond fold is about to be made, as above described. 0 is a blank on which the diamond fold has just been laid, and which is just being left by its plate-knife folder H, and d is a diamond-folded and pasted blank in process of being operated on by the second and third fold forming mechanism.

The method of forming the diamond fold by the conjoint action of an opening finger or strip, a guide-linger, and a rotary plate-knife folder is described in my aforesaid Letters Patent l\'o. 239,456. The improvements I have made on the mechanism for this purpose reside more particularly in the arrangement of the plate-knife folder, and in the construction of the guide-finger. In my said Patent No. 289,456 the rotary plate-knife folderin its descent strikes at an angle upon the uplifted portion of the upper ply, and this, when the parts are in rapid motion, as they must be to do economical work, frequently results in injury to the paper. By my present improvement the plate-knife folder is soplaced that in its descent it meets the still uplifted portion of the upper ply, and in fact at the time of meeting is practically parallel with and moving in the same direction with, instead of at an angle to, the upper ply. This is effected in the present instance by carrying the sprocket ehains on which the plateknife folder is mounted back of the rolls D, instead of letting them stop short of those rolls, as in my aforesaid patent. Under this arrangement the plate-knife folder passes through between the rolls D along with the blank, and said rolls are properly recessed peripherally to accommodate the plate knife folder or series of's'uch'folde'rsl' The result of this rearrangement of the plate-knife folder is, that it operates smoothly, efficiently, with great precision, and without damaging the paper at all.

My improvement in the guide-finger consists in forming or constructing its under face so that it shall exert a spring or yielding pressure upon the blank passing between it and the table, the object being to provide a means by which a yielding tension may be exerted upon the diamond fold as it is being formed, so that it-shall be kept taut or stretched, and thus This re sult is attained in the present instance by fit ting to the finger a bent spring-strip,j, which is fastened to the top of the guide-finger, and thence passes around the end or nose of the same to theunder side, as shown plainly in Fig. 1. The strip does not fit closely to the guide-finger, and has besides on its bent under part a bulging porti0n,j, which acts as a pad or cushion to bear upon the diamond fold of the blank passing beneath. The blank when in this position is being pulled along by its front end or point, and the springpad j at the same time bears with yielding force upon the diamond, putting, as the blank travels along, a tension on the rear flap of the diamond which pulls into shape and smooths the fold and draws the lines of fold more evenly.

The blank after the formation of the diamond 'fold is,"in-the arrangement of mechanism shown in the drawings, still connected to the blank in front by the central uncut portion of the under'ply. To sever this uncut portion, and at the same time to lay the diamond fold and to feed along the blank, I make use of a pair of rolls, K K, hereinbefore referred to. These rolls are made as small as practicable in order that their bite may be brought nearer to the path of movementof the ascending plate-knife folders than would be practicable were they of thesame size as the other rolls, the object being to cause them to take hold of the point of the diamond-folded blank as soon as possible. Inasmuch as all of the rolls that run in contact with the paper must have the same or substantially the same surfacespeed, and inasmuch as the rolls K K are half the size of the other rolls, it follows that they must be driven twice as fastthat is to say, must revolve twice while the other rolls revolve once. Anarrangement of gearing for this purpose is shown in Fig. 3, X being the driving-shaft and Ythe transmitting-gearing, and Z the special gears which drive the two rolls K K.

The pairs of rolls B B, O O, D D, &c., make one revolution for every blank, and consequently the rolls K K make two revolutions for each blank. Roll K carries the knife is, which severs the central uncut portion of the under ply, which connects successive blanks, and consequently it is requisite that this knife should operate once for every two revolutions of the roll. An arrangement for effecting this result is shown in the drawings, more partic- 'ularly in Figs. 4 and 5. The knife It. is carried on astem, Z, which playsin a hole in the roll, and is jointed or linked to a lever, m, pivoted at a in a recess in the hole and pressed by a spring, 0, in a direction to hold the knife normally in retracted position. The tail of the lever m projects from one end of the roll,

as seen in Fig. 5, andis provided with a roller stud, m. Upon the inner face of the frame of the machine, in proximity to the tail of the lever m, is a sliding bar, 1), supported by two headed pins, o whichprojeet from the frame of the machine into and through two guideslots, 8, in the bar.. A spring, it, pulls this.

bar in one direction, and a setscrew, a, projecting through an abutment, v, on the frame,

} (to which the spring also is fastened,) limits the extent to which the bar can be moved by the spring. Upon the inner face of the bar is a cam or incline, to, which, when the bar is pulled back by its spring, as shown in Fig. 4, is out of the path of the tail of lever m. Upon the front end of the bar is a hook,p, and upon the hub of the under one, L, of the pair of pasting-rolls LL is a pin, r, which projects in the path of the hook p, and once in every revolution ofroll L engages the hook, and thereby draws forward the bar 12 (against the stress of its spring) into a position in which the cam or incline 10 will be in the path of the tail of lever m, the movement of roll K being so timed that at this time the tail of lever m will strike the incline, and willthereby be depressed, so as to project the knife k and make the desired cutin the under ply. By this time the roll L has rotated far enough to disengage the pin 1- from the hook p, and the bar 1) is by its spring at once returned to normal position, to there remain until the hook again is engaged by pin 1'. From the rolls K K the blank passes along between the paste-rolls L L,which lay the lines of paste upon the diamond fold in the usual way, paste being supplied to the paste-ribs on the upper roll,

from paste-trough L through the intermediary of the customary paste-delivery rolls, L L, and from the paste-rolls the pasted blank passes to and between the rollsM M and their accessories, by which the second and final folds are made. The upper one, M, of these rolls carries two blades, f f, and the under one, M, carries two nippers, g both knives and nippers being controlled by the conjoint action of cams and spring, and being constructed and arranged to operate as fully set forth in my Letters Patent No. 243,858, to which reference is hereby made.

Itis only necessary here to say that the parts are so positioned and timed that the blade f tucks the leading point or flap of the diamond into the bite of the nipper g on the proper line for the second fold, and that the nipper takes hold of the part thus tucked into its bite and carries the same around under the first wiper-roll, N, and then releases it, the roll end serving to wipe down the second fold thus made, and this folded part passing out into the space between the first and second wiper-rolls N O. In the position of parts shown in Fig. 1 theleading nipper has just released its hold on the front fold, which is being wiped down between the first wiper and the roll M, and the second blade. f,is in the act of tucking the rear fiap,togelher with the underlying portion of the body of the blank,into the bite of its coacting nipper By the continued movement of the rolls that part of the blank in front of the point where the rear nipper takes hold is shunted or deflected off into the space between the two wiper-rolls N O, and the nipper g,still holding the blank,travels under and past the lower or second wiper-roll, O, which has the effect of folding back and down upon the body of the bag in rear of point where it is held by the nipper that part of the blank in front of that point, thus in effect doubling thebag upon itself and making a blind fold therein, but at the same time folding down the third or final fold and completing the satchel-bottom.

Thus far the construction and mode of operation of the parts do not essentially differ from what is shown and described in my Letters Patent No. 243,858, although instead of making the wipers N O mere idlers, as in my patented device. I prefer now to gear them to run with positive motion, as indicated in Fig. 3 at Z Z, the gearing being such that they move at the same peripheral speed with their coacting roll M. The rollers N 0 have also spring-bearings, as shown in Fig. 3, so that they may yield when the blank is passing between them.

I har e found in practice thatif the pressure of the final or second wiper, 0, be continuous upon the bag it is apt in passing over a certain portion of the folded parts to pucker and crease them. The portion referred to is the second fold of the satchelbottom, the one made first by the conjoint action of the nipper 9', blade f, and wiper N, which by the doubling over of the bag upon itself in the operation of making the final fold is brought to the rear, so as to be the last part of the satchelbottom that passes between the second wiper, O, and the roll M. To prevent the injurious action of the second wiper upon this portion of the bag, I put upon the ends of the said wiper ledges or raised parts 71, so positioned that when the portion of the bag referred to is passing between said wiper and the roll M the ledges or flanges It will come against the face of roll M, and thus lift orv press back the wiper away from the roll, in this way relieving the bag of undue pressure.

Having described my improvement and the best way now known to me of carrying the same into effect, what I claim herein as new and of my own invention is- 1. The combination, with the guide-finger and the means for opening the mouth of the blank and directing the upper ply above or upon the guide-finger, of a plate-knife folder rotating or moving continuously in one direction and arranged to meet the upper ply at a point where its plane of motion is substantially parallel with the ply, substantially as and for the purposes hereinbcfore set forth.

2. The combination, with the guide-finger, the opener for the mouth of the blank, and the rolls in advance of which the mouth of the blank is opened, of a plate-knife folder continuously moving or rotating in one direction, and arranged, substantially as described, to travel back of said rolls, and thence to pass forward between them along with the blank, substantially as and for the purposes hereinbefore set forth.

3. The combination of the guide-finger, the

knife folders, and the chains or bands carrying the same, these members being arranged together for joint operation, substantially as hereinbefore set forth.

4. The guidefinger formed or provided on its underface with a spring or yielding pressure-pad arranged and operating to exert a yielding pressure upon the diamond fold as v the latter is being formed, substantially as and for the purpose hereinbefore set forth.

5. The combinatiomwith the diamond-foldforming mechanism, of the kniferoll K and its fellow roll, the reciprocating knife carried by said knife-roll, the cam for operating said knife, and means, substantially as described, for moving said cam into and out of operative position relatively to said knife, at the times and in the manner substantially as set forth.

'stantially as described, for rotating both pairs of rolls at the same peripheral speed, the cam for' operating said knife, and means, substantially as described, for moving the cam into and out of operative position relatively to the knife, at the times and in the manner substantially as hereinbefore set forth.

7. ,The combination, with the blade and nipper carrying rolls for making the second and third folds, of the power-driven wiperroll 0, for laying the final fold, supported in spring or yielding bearings and rotated at the same peripheral speed with the blade and nipper carrying rolls, and provided with cam ledges or flangeswhich act to intermittently I move it outwardly from the said rolls, at the time and in the manner substantially as hereinbefore set forth.

In testimony whereof I have hereunto set Q my hand this 17th day of March, 1885.

6. The combination of the diamond-fold mechanism, the paste-rolls, the knife-roll and f its fellow roll located between the paste-rolls and the diamondiold mechanism, and made 7' halfthe size of the paste-rolls, mechanism, sub- 5 W. o. oaossr Vitnesses:

EWELL A. DICK, J. WVALTER BLANDFORD. 

